It is a duplicate of
Problem 157. The Hitchhiker's Guide to MATLAB : http://www.mathworks.com/matlabcentral/cody/problems/157-the-hitchhiker-s-guide-to-matlab
Not a duplicate, a variation (as mentioned in the description). The previous one returned true/false if the input was the Answer. This one requests that the output be the Answer. :o)
Exact it is a variation
surface of a spherical planet
Who knows the last digit of pi?
Sum the Digits of a Number
Count the Number of Undirected Cycles in a Graph
Count the Number of Directed Cycles in a Graph
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